Pregunta
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On the moon, the equation is used to find the
distance an object has fallen after seconds.
On Earth, the equation is .
A rock is thrown from a height of 90 meters on Earth.
Plot the graph of the equation on a graphing calculator or
other technology to find the time taken to hit the ground
to the nearest second.

Ask by Bob Vaughan. in the United States
Jan 21,2025

Solución de inteligencia artificial de Upstudy

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The rock hits the ground after approximately 4 seconds.

Solución

To determine the time it takes for a rock to hit the ground when thrown from a height of 90 meters on Earth, we’ll use the given equation for distance fallen under gravity:
Where:
  • is the distance fallen in meters.
  • is the time in seconds.
Step 1: Set Up the Equation
When the rock hits the ground, the distance fallen will equal the initial height of 90 meters. Therefore:
Step 2: Solve for
  1. Divide both sides by 4.9:
  2. Take the square root of both sides:
Step 3: Round to the Nearest Second
Rounding to the nearest whole number:
Conclusion:
The rock will hit the ground approximately 4 seconds after being thrown from a height of 90 meters on Earth.
Visual Representation:
If you plot the equation on a graphing calculator:
  1. Graph .
  2. Draw a horizontal line at meters.
  3. Find the intersection point of the two graphs.
This intersection occurs at seconds, confirming our calculation.
Final Answer:
To the nearest second, the rock hits the ground after 4 seconds.

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Beyond the Answer

To solve this problem, we start with the equation for distance on Earth, given as . Since the rock is thrown from a height of 90 meters, we need to set the equation equal to the height from which it was thrown and solve for :
Rearranging this, we have:
Calculating this gives:
Taking the square root results in:
Rounding to the nearest second gives seconds.

On Earth, gravity is about 9.81 m/s², which is reflected in the equation by the factor (since is half of ). This means the rock falls quicker than you’d think! Always remember to adjust the equation based on the height from which you’re dropping or throwing the object.
Opting for technology, grappling with graphing calculators or software (like Desmos) can visually illustrate where the intercepts happen, making it easy to see the exact moment it hits the ground. This can be especially helpful when dealing with different heights or modifying conditions!

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